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BoSS
Mobile Aluminium Tower
1450/850 Ladderspan
3T - Through the Trapdoor Method
USER GUIDE
Edition November 2011
Safety First
Mobile Towers - 3T Method
INTRODUCTION
Please read this guide carefully.
Please note that diagrams are for illustrative purposes only.
User guides are also available to download from our website
at youngmangroup.com
BoSS mobile aluminium towers are light-weight scaffold towers
used throughout the building and construction industry for both
indoor and outdoor access solutions where a stable and secure
platform is required. Ideal for maintenance and installation work or
short-term access, the highly versatile towers provide a strong
working platform for a variety of heights.
This User Guide provides you with step by step instructions to
ensure your system is erected easily and safely, using the 3T
(Through The Trapdoor) method.
The law requires that personnel erecting, dismantling or altering
towers must be competent. Any person erecting a Youngman
BoSS mobile tower must have a copy of this guide. For further
information on the use of mobile access and working towers
consult the PASMA operators code of practice.
If you need further information, design advice, additional guides
or any other help with this product, please contact Youngman on
+44 (0)1621 745900 or email [email protected]
COMPLIANCES
Following examination by the SP
Technical Research Institute of
Sweden, the Boss (Clima and
Evolution) mobile access tower
has been issued with a Type
Examination Certificate
No 249405 in accordance with
the requirements of Ordinance
AFS 1990:12 Stallningar , type
examination rules SPCR 064 for
temporary structures and SS-EN
1004:2005 including appurtenant
standards.
Instruction Manual EN 1298-IM-EN
1
BoSS Ladderspan User Guide
Safety First
PREPARATION AND INSPECTION
Inspect the equipment before use to ensure that it is not
damaged and that it functions properly. Damaged or incorrect
components shall not be used.
SAFE USE
Check that all components are on site, undamaged and that
they are functioning correctly – (refer to Checklist and Quantity
Schedules). Damaged or incorrect components shall not be
used.
Check if the ground on which the mobile access tower is to be
erected and moved is capable of supporting the tower.
The safe working load is 275 kgs (606lbs), per platform level,
uniformly distributed up to a maximum of 950kgs (2100lbs),
per tower (including self weight).
Towers must always be climbed from the inside using the built
in ladder during assembly and use.
It is recommended that towers should be tied to a solid
structure when left unattended.
Adjustable legs should only be used for levelling.
LIFTING OF EQUIPMENT
Tower components should be lifted using a reliable lifting
material (e.g. strong rope), employing a reliable knot (e.g.
clove hitch), to ensure safe fastening and always lift within the
footprint of the tower.
Assembled mobile towers should not be lifted with a crane or
other lifting device.
youngmangroup.com
2
Safety First
STABILISERS / BALLAST
Stabilisers or outriggers and ballast weights shall always be
fitted when specified.
The Quantity Schedules show the recommended stabilisation.
In circumstances where there is restricted ground clearance
for stabilisers/outriggers, contact your supplier for advice.
Ballast must be of solid materials (i.e. not water or loose sand)
and should not be positioned to overload individual legs.
Ballast should be secured against accidental removal where
practicable, and be supported on the lowest rung of the
bottom frame.
MOVEMENT
The tower should only be moved by manual effort, and only
from the base.
When moving the tower, beware of live electrical apparatus,
particularly overhead, plus wires or moving parts of machinery.
No person or materials should be on the tower during
movement.
Caution should be exercised when wheeling a tower over
rough, uneven or sloping ground, taking care to unlock and
lock castors. If stabilisers are fitted, they should only be lifted
a maximum of 25mm above the ground to clear ground
obstructions.
The overall height of the tower when being moved, should not
exceed 2.5 times the minimum base dimensions, or 4 metres
overall height.
Before use, check the tower is still correct and complete.
After every movement of the tower use a spirit level to check
that it is vertical and level and set the adjustable legs as
required.
Do not move the tower in wind speeds over 7.7 metres per
second (17mph).
3
BoSS Ladderspan User Guide
Safety First
DURING USE
Beware of high winds in exposed, gusty or medium breeze
conditions. We recommend that in wind speeds over 7.7 metres
per second (17 mph), cease working on the tower and do not
attempt to move it. If the wind becomes a strong breeze,
expected to reach 11.3 metres per second (25 mph), tie the
tower to a rigid structure. If the wind is likely to reach gale
force, over 18 metres per second (40 mph), the tower should be
dismantled.
Wind
Description
Beaufort Scale
Beaufort
No.
Speed
in m.p.h
Speed
in m/sec
Medium
Breeze
Raises dust and
loose paper,
twigs snap off
4
8-12
4-6
Strong
Breeze
Large branches
in motion,
telegraph wires
whistle
6
25-31
11-14
Gale Force
Walking is
difficult
8
39-46
17-21
Beware of open ended buildings, which can cause funnelling
effect.
Do not abuse equipment. Damaged or incorrect components
shall not be used.
Raising and lowering components, tools, and/or materials by
rope should be conducted within the lower base. Ensure that
the safe working load of the supporting decks and the tower
structure is not exceeded.
The assembled tower is a working platform and should not be
used as a means of access or egress to other structures.
Beware of horizontal forces (e.g. power tools) which could
generate instability. Maximum horizontal force 20 kg.
The stairway towers, featuring an inclined staircase access, are
for frequent use by personnel carrying tools and/or materials.
Mobile towers are not designed to be suspended - please
refer to your supplier for advice.
Do not use boxes or stepladders or other objects on the
platform to gain extra height.
youngmangroup.com
4
Safety First
TIES
Ties should be used when the tower goes beyond its safe
height, beyond the limits of the stabilisers/outriggers, or if
there is a danger of instability. They should be rigid, two way
ties fastened to both uprights of the frame with load-bearing
right angled or swivel couplers. Only couplers suitable for the
50.8mm diameter tube of the tower should be used. Ideally,
ties should be secured to both faces of a solid structure by
means of anchorages.
The tie frequency may vary depending on the application, but
they should, at a minimum, be every 4 metres height.
For further information on tying-in a tower please contact your
supplier or Youngman.
MAINTENANCE - STORAGE - TRANSPORT
All components and their parts should be regularly inspected
to identify damage, particularly to joints. Lost or broken parts
should be replaced, and any tubing with indentation greater
than 5mm should not be used and put to one side for
manufacture repair. Adjustable leg threads should be cleaned
and lightly lubricated to keep them free running.
Brace claws, frame interlock clips, trapdoor latches and
platform windlocks should be regularly checked to ensure they
lock correctly.
Refer to the BoSS Inspection Manual for detailed inspection
and maintenance advice
Components should be stored with due care to prevent
damage.
Ensure components are not damaged by excessive strapping
forces when transported.
5
BoSS Ladderspan User Guide
Safety First
End Toeboard
4 Rung Ladder Frame
Horizontal
Brace
4 Rung
Frame
Side
Toeboard
Platform
(Fixed and
Trapdoor Decks)
Diagonal
Brace
Stabiliser
2 Rung
Frame
Castor
2 Rung Ladder Frame
Adjustable Leg
6
7
1
1
6
2
1.8m and 2.5m Fixed Deck
1.8m and 2.5m Trap Door Deck
1.8m and 2.5m Horizontal Brace (red)
2.1m and 2.7m Diagonal Brace (blue)
3
6
1
1
3
6
1
1*
1
1
1
1
4
4
4.2
2.2
4
6
1
2
1
1
1
1
4
4
4.7
2.7
5
10
2
1
2
2
4
4
5.2
3.2
6
10
2
1
1
1
1
1
1
1
4
4
5.7
3.7
7
10
2
1
2
2
1
1
4
4
6.2
4.2
8
10
2
2
2
2
1
1
4
4
6.7
4.7
9
14
3
1
3
3
4
4
7.2
5.2
10
14
3
1
2
2
1
1
1
1
4
4
7.7
5.7
11
14
3
1
3
3
1
1
4
4
8.2
6.2
12
14
3
2
3
3
1
1
4
4
8.7
6.7
13
18
4
1
4
4
4
4
9.2
7.2
14
18
4
1
3
3
1
1
1
1
4
4
9.7
7.7
15
18
4
1
4
4
1
1
4
4
10.2
8.2
16
18
4
2
4
4
1
1
4
4
10.7
8.7
17
22
5
1
5
5
4
4
11.2
9.2
18
22
5
1
4
4
1
1
1
1
4
4
11.7
9.7
19
22
5
1
5
5
1
1
4
4
12.2
10.2
20
22
5
2
5
5
1
1
4
4
12.7
10.7
21
26
6
1
6
6
4
4
13.2
11.2
Internal Use
22
26
6
1
5
5
1
1
1
1
4
4
13.7
11.7
IMPORTANT: Please ensure you also read the Quantity Schedule on page 8.
* If you are unable to position the working platform easily from the ground, you may require an additional fixed platform for this tower
height.
1
1450 4 Rung Span Frame
1
1450 3 Rung Span Frame
1
1
1450 3 Rung Ladder Frame
1450 4 Rung Ladder Frame
1
1450 2 Rung Span Frame
4
4
1
4
3.7
1.7
1450 2 Rung Ladder Frame
4
3.2
1.2
Adjustable leg assembly
WORKING HEIGHT (m)
PLATFORM HEIGHT (m)
125/150/200mm Castor
COMPONENT
Internal/External Use - Towers under 2.5m are outside of the scope of EN1004 BoSS 1450 Ladderspan to EN 1004: Available in 2 lengths - 1.8m and 2.5m
23
26
6
1
6
6
1
1
4
4
14.2
12.2
Quantity Schedule
1450 Width Towers
2
4
Toeboard Holder
2.5m TOWER Total Self-weight (kgs)
116
99
4
2
2
3.7
1.7
143
103
4
2
2
4.2
2.2
169
146
4
4
2
2
4.7
2.7
See pages 10 and 30 for stabiliser positions.
91
108
1.8m TOWER Total Self-weight (kgs)
SP15 Telescopic Stabiliser
SP10 Telescopic Stabiliser
SP7 Fixed Stabiliser
2
3.2
1.2
1.2m End Toeboard
WORKING HEIGHT (m)
PLATFORM HEIGHT (m)
1.8m and 2.5m Side Toeboard
COMPONENT
185
161
4
4
2
2
5.2
3.2
194
169
4
4
2
2
5.7
3.7
201
175
4
4
2
2
6.2
4.2
226
195
4
4
2
2
6.7
4.7
243
210
4
4
2
2
7.2
5.2
264
231
4
4
2
2
7.7
5.7
271
237
4
4
2
2
8.2
6.2
296
257
4
4
2
2
8.7
6.7
313
272
4
4
2
2
9.2
7.2
321
279
4
4
2
2
9.7
7.7
343
300
4
4
2
2
10.2
8.2
354
306
4
4
2
2
10.7
8.7
370
320
4
4
2
2
11.2
9.2
378
328
4
4
2
2
11.7
9.7
385
334
4
4
2
2
12.2
10.2
411
354
4
4
2
2
12.7
10.7
427
369
4
4
2
2
13.2
11.2
Internal/External Use Internal Use
BoSS 1450 Ladderspan to EN 1004: Available in 2 lengths - 1.8m and 2.5m
436
377
4
4
2
2
13.7
11.7
443
383
4
4
2
2
14.2
12.2
Quantity Schedule
1450 Width Towers
8
Quantity Schedule
1450 Width Towers
NUMBER OF WORKING PLATFORMS ALLOWED
The MAXIMUM SAFE WORKING LOAD (the combined weight of
the users, tools and materials) that may be placed on the tower is
the total weight less the self weight of the tower. The total weight
for the towers shown in the schedule is 950kg.
Example 1:
A 1450 tower built using the 3T method with a 4.2m platform
height and a platform length of 1.8m has a self weight of 175kg.
950kg — 180kg = 775kg maximum safe working load
total weight self weight (users, tools and materials)
Example 2:
A 1450 tower built using the 3T method with a 11.7m platform
height and a platform length of 2.5m has a self weight of 436kg.
950kg — 436kg = 514kg maximum safe working load
total weight self weight (users, tools and materials)
For greater heights and loads, consult Youngman for guidance.
PLATFORM LOADING
On a 1450 tower a platform may comprise of a single deck or two
decks placed side by side. The maximum safe working load
(the combined weight of the users, tools and materials) that may
be placed on a platform is 275kg. This must be evenly distributed
over either one deck, or two decks placed side by side.
The quantities on pages 7 and 8, will enable BoSS towers to be
built safely and therefore comply with the requirements of the
Work at Height Regulations. They include double guardrails
to all platforms, and toeboards will need to be added if any levels
are used as working platforms and for storage of materials.
EN 1004 requires platforms at least every 4.2m, and these
measures will exceed that requirement.
9
Quantity Schedule
1450 Width Towers
BALLAST: Internal/External Use
There is no requirement for ballast on 1450 towers if using
stabilisers as detailed in the table on page 8.
MOBILE OUTRIGGERS
MP16 outriggers can be used instead of SP15 stabilisers, as
detailed below. Mobile outrigger kits comprise:
Mobile Outrigger Kit
MP16 Mobile Outrigger
4
125/150/200mm Castor
(Use same diameter castors as on
tower)
4
250mm Adjustable leg
4
Plan Braces
4
The above components replace:
SP15 Stabiliser
4
STABILISERS
To improve rigidity, larger stabilisers can be used at a lower level
than shown in the table on page 8.
Angle of Stabiliser 1450 TOWER
X
X
90°
Double width 1450 Towers Dimension X
Platform Length 1.8m
Platform Length 2.5m
SP7
X= 3351
X= 3629
SP10
X= 4789
X= 5100
SP15
X= 5520
X= 5838
Stabiliser feet should form a square as shown in the diagram and
table above.
youngmangroup.com
10
11
4
4
4
125/150/200mm Castor
Adjustable leg assembly 4
3
2
2
3
6
2
4
6
2
1
1
1
1
4
4
4.7
2.7
2
5
10
2
2
2
4
4
5.2
3.2
2
6
10
2
1
1
1
1
1
1
4
4
5.7
3.7
2
7
10
2
2
2
1
1
4
4
6.2
4.2
2
8
10
3
2
2
1
1
4
4
6.7
4.7
2
9
14
3
3
3
4
4
7.2
5.2
2
10
14
3
2
2
1
1
1
1
4
4
7.7
5.7
2
11
14
3
3
3
1
1
4
4
8.2
6.2
2
12
14
4
3
3
1
1
4
4
8.7
6.7
2
13
18
4
4
4
4
4
9.2
7.2
2
14
18
4
3
3
1
1
1
1
4
4
9.7
7.7
2
15
18
4
4
4
1
1
4
4
10.2
8.2
2
16
18
5
4
4
1
1
4
4
10.7
8.7
2
17
22
5
5
5
4
4
11.2
9.2
2
18
22
5
4
4
1
1
1
1
4
4
11.7
9.7
2
19
22
5
5
5
1
1
4
4
12.2
10.2
2
20
22
6
5
5
1
1
4
4
12.7
10.7
2
21
26
6
6
6
4
4
13.2
11.2
Internal Use
2
22
26
6
5
5
1
1
1
1
4
4
13.7
11.7
2
23
26
6
6
6
1
1
4
4
14.2
12.2
IMPORTANT: Please ensure you also read the Quantity Schedule on page 12.
* If you are unable to position the working platform easily from the ground, you may require an additional fixed platform for this tower height.
2
2
2.1m and 2.7m Diagonal Brace (blue)
1.8m and 2.5m Side Toeboard
1
6
1*
1
6
1.8m and 2.5m Trap Door Deck
1.8m and 2.5m Horizontal Brace (red)
1
1
1
850 4 Rung Span Frame
1
850 3 Rung Span Frame
1
1
850 3 Rung Ladder Frame
1
1
4
4
4.2
2.2
850 4 Rung Ladder Frame
1
1
850 2 Rung Ladder Frame
850 2 Rung Span Frame
4
3.7
1.7
WORKING HEIGHT (m) 3.2
PLATFORM HEIGHT (m) 1.2
COMPONENT
Internal/External Use - Towers under 2.5m are outside of the scope of EN1004 BoSS 850 Ladderspan to EN 1004: Available in 2 lengths - 1.8m and 2.5m
Quantity Schedule
850 Width Towers
4
90
79
4
2
3.7
1.7
4
4
2
4.7
2.7
4
4
2
5.2
3.2
4
4
2
5.7
3.7
4
4
2
6.2
4.2
4
4
2
6.7
4.7
4
4
2
7.2
5.2
4
4
2
7.7
5.7
4
4
2
8.2
6.2
4
4
2
8.7
6.7
4
4
2
9.2
7.2
4
4
2
9.7
7.7
117 143 158 165 172 198 225 233 239 264 280 286
106 126 139 146 151 172 186 204 210 230 243 250
4
4
2
4.2
2.2
See pages 14 and 30 for stabiliser positions.
72
84
1.8m TOWER Total Self-weight (kgs)
2.5m TOWER Total Self-weight (kgs)
SP15 Telescopic Stabiliser
SP10 Telescopic Stabiliser
SP7 Fixed Stabiliser
2
Toeboard Holder
WORKING HEIGHT (m) 3.2
PLATFORM HEIGHT (m) 1.2
0.6m End Toeboard
COMPONENT
382
270
4
4
2
10.2
8.2
318
276
4
4
2
10.7
8.7
Internal/External Use - Towers under 2.5m are outside of the scope of EN1004 BoSS 850 Ladderspan to EN 1004: Available in 2 lengths - 1.8m and 2.5m
334
289
4
4
2
11.2
9.2
341
296
4
4
2
11.7
9.7
347
301
4
4
2
12.2
10.2
372
321
4
4
2
12.7
10.7
488
335
4
4
2
13.2
11.2
Internal Use
395
341
4
4
2
13.7
11.7
401
347
4
4
2
14.2
12.2
Quantity Schedule
850 Width Towers
12
Quantity Schedule
850 Width towers
NUMBER OF WORKING PLATFORMS ALLOWED
The MAXIMUM SAFE WORKING LOAD (the combined weight of
the users, tools and materials) that may be placed on the tower is
the total weight less the self weight of the tower. The total weight
for the towers shown in the schedule is 950kg.
Example 1:
An 850 tower built using the 3T method with a 4.2m platform
height and a platform length of 1.8m has a self weight of 151kg.
950kg — 151kg = 799kg maximum safe working load
total weight self weight (users, tools and materials)
Example 2:
An 850 tower built using the 3T method with a 11.7m platform
height and a platform length of 2.5m has a self weight of 408kg.
950kg — 410kg = 540kg maximum safe working load
total weight self weight (users, tools and materials)
For greater heights and loads, consult Youngman for guidance.
PLATFORM LOADING
On an 850 tower a platform comprises of a single deck only. The
maximum safe working load (the combined weight of the users,
tools and materials) that may be placed on a platform is 275kg,
evenly distributed over the deck.
The quantities on pages 11 and 12, will enable BoSS towers to
be built safely and therefore comply with the requirements of the
Work at Height Regulations 2005. They include double guardrails
to all platforms, and toeboards will need to be added if any levels
are used as working platforms and for storage of materials.
EN 1004 requires platforms at least every 4.2m, and these
measures will exceed that requirement.
13
Quantity Schedule
850 Width Towers
BALLAST: Internal/External Use
There is no requirement for ballase on 850 towers if using
stabilisers as detailed in the table on page 12
MOBILE OUTRIGGERS
MP16 mobile outriggers can be used instead of SP15 telescopic
stabilisers respectively, as detailed below.
Mobile outrigger kits comprise:
Mobile Outrigger Kit
MP16 Mobile Outrigger
4
125/150/200mm Castor
(Use same diameter castors as on
tower)
4
250mm Adjustable leg
4
Plan Braces
4
The above components replace:
SP15 Stabiliser
4
STABILISERS
To improve rigidity, larger stabilisers can be used at a lower level
than shown in the table on page 12.
X
X
90°
Single Width 850 Towers Dimension X
Platform Length 1.8m
Platform Length 2.5m
SP7
X= 2994
X= 3201
SP10
X= 4458
X= 4734
SP15
X= 5195
X= 5485
Stabiliser feet should form a square as shown in the diagram and
table above.
14
Assembly Procedure
Mobile Towers - 3T Method
ASSEMBLY AND DISMANTLING PROCEDURES
When building a BoSS Tower:
To comply with the Work at Height Regulations we show
assembly procedures with platforms every 2 metres in height,
and, the locating of guardrails in advance of climbing onto a
platform to reduce the risk of a fall.
All platforms feature double guardrails on both faces of either
individual platforms or fully decked levels.
All guardrails should be 1 and 2 rungs (0.5m and 1.0m) above
platforms.
Never stand on an unguarded platform positioned above the
first rung of a tower. If your risk assessment shows it necessary,
you may also need to guardrail platforms at this level.
Always start building with the smallest height frames at
the base of the tower:
Platform Heights in Metres
Frame at base
1.7, 2.2, 3.7, 4.2, 5.7, 6.2, 7.7, 8.2, 9.7, 10.2, 11.7, 12.2
2 rung
2.7, 4.7, 6.7, 8.7, 10.7
3 rung
1.2, 3.2, 5.2, 7.2, 9.2, 11.2
4 rung
Where all 3 frame heights are used in a tower, start with 2 rung
frames at the base, with the 3 rung frames next and the 4 rung
frames on the top. Refer to the quantity schedules for detail.
TO DISMANTLE A BOSS Ladderspan TOWER
Remove toeboards, and pass down the tower.
Unclip farthest end of braces and immediately go to protected
trapdoor position on ladder to complete removal.
Remove upper platforms from protected platform levels below.
Pass removed components out of the tower to a colleague.
15
Safety Checklist
Mobile Towers - 3T Method
CHECKLIST
Ensure all brace claws operate and lock correctly prior to erection
Inspect components prior to erection
Inspect tower prior to use
Tower upright and level
Castors locked and legs correctly adjusted
Diagonal braces fitted
Stabilisers/outriggers fitted as specified
Platforms located and windlocks on
Toeboards located
Check guardrails are fitted correctly. See illustration below.
16
Assembly Procedure
Mobile Towers - 1450 3T Method
ASSEMBLY FOR 1450 TOWERS
Always start building with the smallest height frames at the
base of the tower:
Platform Heights in Metres
Frame at base
1.7, 2.2, 3.7, 4.2, 5.7, 6.2, 7.7, 8.2, 9.7, 10.2, 11.7, 12.2
2 rung
2.7, 4.7, 6.7, 8.7, 10.7
3 rung
1.2, 3.2, 5.2, 7.2, 9.2, 11.2
4 rung
Where all 3 frame heights are used in a tower, start with 2 rung
frames at the base, with the 3 rung frames next and the 4 rung
frames on the top. Refer to the Quantity Schedules for detail.
The procedure illustrated shows 4.2m platform height tower
startingwith a 2 rung frame.
Youngman recommend two persons are used to build BoSS
Towers. Above 4m height, it is essential that at least two
persons are used. Only climb the tower from the inside.
Push castor into adjustable leg. Push Castor /adjustable leg
assemblies into 2 rung span frame. Lock castors. Repeat
proceadure with 2 rung ladder frame.
1
It is recommended that for ease of levelling a gap of 50mm is left
between the bottom of the leg and the adjustable nut. Adjustable
Legs are for levelling only. You must not adjust all four to gain extra
height.
NB: Base plates can be fitted to adjustable legs in lieu of
castors if it is not necessary to move the tower.
17
Assembly Procedure
Fit one horizontal brace (red) onto the vertical of an span
frame, just above the bottom rung, with the claw facing
outwards. The frame will now be self supporting.
Note: All locking claws must be opened before fitting.
2
Position the ladder frame as shown and fit the other end of
the horizontal brace on to the vertical, just above the bottom
rung. Fit a second horizontal brace between the bottom rungs on
the other side of the frames to square the tower.
3
18
Assembly Procedure
Fit 2 additional end frames ensuring the frame interlock
clips are engaged. Fit 2 diagonal braces (blue) in opposing
directions, between the 1st and the 3rd rungs. Ensure the frames
are vertical and level by checking with a spirit level and setting the
adjustable legs as required. Fit stabilisers (see noteson page
30).
4
IMPORTANT – Only use the adjustable legs to level the tower
and not to gain extra height.
19
Assembly Procedure
Fit a temporary deck on the lowest rungs. Fit a trapdoor
deck on the 4th rung (2.0m) with the trapdoor next to the
ladder. Ensure the trapdoor is positioned with the hinges towards
the outside of the tower as shown. Climb the ladder and, from the
protected trapdoor position, fit guardrails on the 5th and 6th rungs
(in that order) on both sides of the platform.
5
Do not climb onto the deck until it is fully guardrailed.
When horizontal braces are fitted as guardrails, they should be
0.5m and 1.0m (1 and 2 rungs) above the platform level in all
cases.
Remove the temporary deck from the lowest rung
20
Assembly Procedure
6
Fit the next pair of diagonal braces in opposing directions
between the 3rd and 5th rungs add 2 additional end frames.
Add two more diagonal braces between the 5th and 7th
rungs. If finishing at this height (4.2m platform),reposition
the fixed deck to the 8th rung on the tower. Fit a trapdoor deck
alongside it, with the hinges towards the outside of the tower, and
the trapdoor next to the ladder. Add a single diagonal between the
7th and 9th rungs as shown. Climb up the ladder, and from the
protected trapdoor position, fit the guardrails on the 9th and 10th
rungs, in that order, on both sides of the tower.
7
21
BoSS Ladderspan User Guide
Assembly Procedure
When building beyond a 4.2m platform height.
Continue to add pairs of end frames, diagonal braces and
fit trapdoor decks as shown in the previous steps. Add
guardrails at 0.5m and 1.0m, (in that order), above the
platform from the protected trapdoor position.
Do not climb onto the platform until it is fully guardrailed.
8
Continue until the required height is reached. Re-position the
fixed deck to the required platform height and fit a trapdoor deck
alongside it as shown in stage 7. Fit a single diagonal at the top
of the tower as shown in stage 7. Fit the final guardrails as shown
in stage 7.
youngmangroup.com
22
Assembly Procedure
7
Fit toeboards (see Instructions on page 29).
The tower is now complete.
Dismantling Procedure
To take down the tower reverse the building sequence.
When removing guardrail braces, unlock the 4 claws
furthest from the trapdoor and then return immediately to the
protected position within the trapdoor. You may then unlock the
claws at the other ends of the guardrails to remove them from the
tower.
10
23
BoSS Ladderspan User Guide
Assembly Procedure
Mobile Towers - 850 3T Method
ASSEMBLY FOR 850 TOWERS
Always start with the smallest height frames at the base of the
tower:
Platform height in Metres
Frame at base.
1.7, 2.2, 3.7, 4.2, 5.7, 6.2, 7.7, 8.2, 9.7, 10.2, 11.7, 12.2
2 Rung
2.7,4.7,6.7,8.7,10,7
3 Rung
1.2,3.2,5.2,7.29.2,11.2
4 Rung
Where all 3 frame heights are used in a tower, start with 2 rung
frames at the base, with the 3 rung frames next and the 4 rung
frames on the top. Refer to the quantity schedules for detail.
The procedure illustrated shows a 3.2m platform height tower
starting with an 4 rung frame.
Insert adjustable leg/castor assemblies into end frames and
lock the castors, see diagram Step 1 (page 17). Base plates
can be fitted to the adjustable legs if it is not necessary to move
the tower. Fit 2 horizontal braces to the 850 end frames as shown
in steps 2 and 3 for the 1450 tower procedure (page 18).
1
Fit a trapdoor deck on the 2nd rung. Fix the horizontal
braces (red) as guardrails on the 3rd and 4th rungs (2 and 4
rungs above the platform) on both sides of the tower.
2
24
Assembly Procedure
Fit 2 diagonal braces in opposing directions between the
1st and 3rd rungs. Ensure the frames are vertical and level
by checking with a spirit level and setting the adjustable legs as
necessary. Fit stabilisers (see notes on page 30). Fit the next pair
of end frames and check the frame interlock clips are engaged.
3
IMPORTANT. Only use the adjustment on the legs to level the
tower and not to gain extra height.
25
Assembly Procedure
Fit 2 pairs of diagonal braces in opposing directions
between the 3rd and 5th rungs and the 5th and7th rungs.
Locate a trapdoor deck on the 6th rung, with the trapdoor next to
the ladder.
4
26
Assembly Procedure
Climb up the inside of the tower and from the protected
position of the trapdoor, fit guardrails to the 7th and 8th
rungs, (in that order), on both sides of the tower.
5
27
Assembly Procedure
Continue the procedure until the required working height is
reached, adding additional pairs of end frames, diagonal
braces and fitting trapdoor platforms, as shown on previous steps.
At every platform level, add horizontal braces as guardrails from
the protected position within the trapdoor, (as shown in step 5).
6
Fit a single diagonal at the top of the tower as shown.
Fit the toeboards (see instruction on page 29).
The tower is now complete.
Dismantling Procedure
To take down the tower reverse the building sequence.
When removing guardrail braces, unlock the 4 claws
furthest from the trapdoor and then return immediately to the
protected position within the trapdoor. You may then unlock the
claws at the other ends of the guardrails to remove them from the
tower.
7
28
Toeboards
Mobile Towers - 3T Method
FITTING TOEBOARDS
Lock yellow plastic toeboard clips over rung and deck claw as
shown. Position as (A) on right hand deck claw. On other side of
the working platform, position the clip as (B). Place 25mm thick
toeboards into slots in toeboard clips as shown.
Side Toeboard
End
Toeboard
Toeboard Clip
(A)
Claw
(B)
Deck
Rung
29
Stabilisers and Outriggers
Mobile Towers - 3T Method
STABILISERS
Attach one stabiliser to each corner of the tower as shown. Ensure
stabiliser feet are equally spaced to form a square.
SP10 and SP15 telescopic stabilisers must always be fully
extended.
Position the lower clamp so that the lower arm is as close to the
horizontal as possible. Adjust the position of the top clamp to
ensure the stabiliser foot is in firm contact with the ground. Ensure
clamps are secure.
Stabilisers are used when the tower is to be moved occasionally,
frequent movement will require mobile outriggers.
When moving the tower, adjust the top clamps to lift the four
stabiliser feet a maximum of 25mm off the ground and then
unlock the castor brakes. After moving ensure all four stabiliser
feet are repositioned in firm contact with the ground.
STABILISER DIMENSIONS
ion
ns
xte
xE
Ma
y
SP7
1227
SP10
2241
SP15
2757
y
OUTRIGGERS
For information on mobile outriggers please consult your supplier.
30
For further information about
this product or any other
products and services,
please contact :
Youngman are members of:
Youngman Group Ltd
The Causeway, Maldon,
Essex, CM9 4LJ,
United Kingdom
t +44 (0)1621 745900
f +44 (0)1621 859845
e [email protected]
youngmangroup.com
Part No: 032994 Date: 11/11